package cn.tedu;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;

public class Demo09 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入用户名");
        String username = scanner.nextLine();
        System.out.println("请输入密码");
        String password = scanner.nextLine();
        System.out.println("请输入昵称");
        String nick = scanner.nextLine();

        //获取链接
        try (Connection conn = DBUtils.getConn()){
            String sql = "select id from user where username?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,username);
            ResultSet rs = ps.executeQuery();
            if(rs.next()){
                System.out.println("用户名已存在");
                return;
            }
            String insertSql = "insert into user values(null,?,?,?)";
            PreparedStatement ips = conn.prepareStatement(insertSql);
            ips.setString(1,username);
            ips.setString(2,password);
            ips.setString(3,nick);
            ips.executeQuery();
            System.out.println("注册成功");
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }

    }
}
